Browsing by Author "1911471643"

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    Enhanced Third Harmonic Generation (THG) with Graphite Metasurface
    (North South University, 2023) Ybtida Cinderella; Nasim Md Arafat Saikat; Mahdy Rahman Chowdhury; 1921957043; 1911471643
    This project introduces an innovative concept for improving third harmonic generation (THG) at far infrared and terahertz (THz) frequencies by employing ultrathin nonlinear meta surface designs of patterned graphite micro-ribbons. By utilizing the localized plasmonic effects, these configurations make it possible to produce an incident wave that is tightly confined and significantly amplified along the surface of the graphite. Because of the presence of a metallic substrate beneath the graphite micro ribbons, the resonant response bandwidth is reduced, which leads to the absence of any transmission and the development of standing waves within the intermediate dielectric spacer layer. This strategy results in a significant increase in the efficiency with which THGs are converted, one that could be increased by several orders of magnitude. Additionally, the meta surface's resonant frequency can be dynamically modified by changing the Fermi energy of the graphite through either electrical or chemical doping. This can be done to get the desired effect. The stimulation of highly localized plasmons within graphite micro-ribbons are the primary topic of this paper. This stimulation ultimately results in the confinement and intensification of the incident wave along the graphite surface. In addition, the presence of a metallic substrate beneath the graphite micro ribbons results in the induction of zero transmission and the generation of standing waves within the intermediate dielectric spacer layer, which together have the effect of narrowing the bandwidth of the resonant response. In the end, these improvements in the incident field contribute greatly to the gain in the efficiency with which THGs are converted.